[mirror_ubuntu-jammy-kernel.git] / net / sched / act_police.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/act_police.c	Input police filter
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 * 		J Hadi Salim (action changes)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/act_api.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_police.h>

/* Each policer is serialized by its individual spinlock */

static unsigned int police_net_id;
static struct tc_action_ops act_police_ops;

static int tcf_police_walker(struct net *net, struct sk_buff *skb,
				 struct netlink_callback *cb, int type,
				 const struct tc_action_ops *ops,
				 struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	[TCA_POLICE_RATE]	= { .len = TC_RTAB_SIZE },
	[TCA_POLICE_PEAKRATE]	= { .len = TC_RTAB_SIZE },
	[TCA_POLICE_AVRATE]	= { .type = NLA_U32 },
	[TCA_POLICE_RESULT]	= { .type = NLA_U32 },
};

static int tcf_police_init(struct net *net, struct nlattr *nla,
			       struct nlattr *est, struct tc_action **a,
			       int ovr, int bind, bool rtnl_held,
			       struct tcf_proto *tp,
			       struct netlink_ext_ack *extack)
{
	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
	struct nlattr *tb[TCA_POLICE_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_police *parm;
	struct tcf_police *police;
	struct qdisc_rate_table *R_tab = NULL, *P_tab = NULL;
	struct tc_action_net *tn = net_generic(net, police_net_id);
	struct tcf_police_params *new;
	bool exists = false;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
					  police_policy, NULL);
	if (err < 0)
		return err;

	if (tb[TCA_POLICE_TBF] == NULL)
		return -EINVAL;
	size = nla_len(tb[TCA_POLICE_TBF]);
	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
		return -EINVAL;

	parm = nla_data(tb[TCA_POLICE_TBF]);
	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	if (!exists) {
		ret = tcf_idr_create(tn, parm->index, NULL, a,
				     &act_police_ops, bind, true);
		if (ret) {
			tcf_idr_cleanup(tn, parm->index);
			return ret;
		}
		ret = ACT_P_CREATED;
		spin_lock_init(&(to_police(*a)->tcfp_lock));
	} else if (!ovr) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	police = to_police(*a);
	if (parm->rate.rate) {
		err = -ENOMEM;
		R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
		if (R_tab == NULL)
			goto failure;

		if (parm->peakrate.rate) {
			P_tab = qdisc_get_rtab(&parm->peakrate,
					       tb[TCA_POLICE_PEAKRATE], NULL);
			if (P_tab == NULL)
				goto failure;
		}
	}

	if (est) {
		err = gen_replace_estimator(&police->tcf_bstats,
					    police->common.cpu_bstats,
					    &police->tcf_rate_est,
					    &police->tcf_lock,
					    NULL, est);
		if (err)
			goto failure;
	} else if (tb[TCA_POLICE_AVRATE] &&
		   (ret == ACT_P_CREATED ||
		    !gen_estimator_active(&police->tcf_rate_est))) {
		err = -EINVAL;
		goto failure;
	}

	if (tb[TCA_POLICE_RESULT]) {
		tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
		if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
			NL_SET_ERR_MSG(extack,
				       "goto chain not allowed on fallback");
			err = -EINVAL;
			goto failure;
		}
	}

	new = kzalloc(sizeof(*new), GFP_KERNEL);
	if (unlikely(!new)) {
		err = -ENOMEM;
		goto failure;
	}

	/* No failure allowed after this point */
	new->tcfp_result = tcfp_result;
	new->tcfp_mtu = parm->mtu;
	if (!new->tcfp_mtu) {
		new->tcfp_mtu = ~0;
		if (R_tab)
			new->tcfp_mtu = 255 << R_tab->rate.cell_log;
	}
	if (R_tab) {
		new->rate_present = true;
		psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
		qdisc_put_rtab(R_tab);
	} else {
		new->rate_present = false;
	}
	if (P_tab) {
		new->peak_present = true;
		psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
		qdisc_put_rtab(P_tab);
	} else {
		new->peak_present = false;
	}

	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
	if (new->peak_present)
		new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
							 new->tcfp_mtu);

	if (tb[TCA_POLICE_AVRATE])
		new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);

	spin_lock_bh(&police->tcf_lock);
	spin_lock_bh(&police->tcfp_lock);
	police->tcfp_t_c = ktime_get_ns();
	police->tcfp_toks = new->tcfp_burst;
	if (new->peak_present)
		police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	spin_unlock_bh(&police->tcfp_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	rcu_swap_protected(police->params,
			   new,
			   lockdep_is_held(&police->tcf_lock));
	spin_unlock_bh(&police->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
	if (new)
		kfree_rcu(new, rcu);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);
	return ret;

failure:
	qdisc_put_rtab(P_tab);
	qdisc_put_rtab(R_tab);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
release_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;
	s64 now, toks, ptoks = 0;
	int ret;

	tcf_lastuse_update(&police->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);

	ret = READ_ONCE(police->tcf_action);
	p = rcu_dereference_bh(police->params);

	if (p->tcfp_ewma_rate) {
		struct gnet_stats_rate_est64 sample;

		if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
		    sample.bps >= p->tcfp_ewma_rate)
			goto inc_overlimits;
	}

	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
		if (!p->rate_present) {
			ret = p->tcfp_result;
			goto end;
		}

		now = ktime_get_ns();
		spin_lock_bh(&police->tcfp_lock);
		toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
		if (p->peak_present) {
			ptoks = toks + police->tcfp_ptoks;
			if (ptoks > p->tcfp_mtu_ptoks)
				ptoks = p->tcfp_mtu_ptoks;
			ptoks -= (s64)psched_l2t_ns(&p->peak,
						    qdisc_pkt_len(skb));
		}
		toks += police->tcfp_toks;
		if (toks > p->tcfp_burst)
			toks = p->tcfp_burst;
		toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
		if ((toks|ptoks) >= 0) {
			police->tcfp_t_c = now;
			police->tcfp_toks = toks;
			police->tcfp_ptoks = ptoks;
			spin_unlock_bh(&police->tcfp_lock);
			ret = p->tcfp_result;
			goto inc_drops;
		}
		spin_unlock_bh(&police->tcfp_lock);
	}

inc_overlimits:
	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
inc_drops:
	if (ret == TC_ACT_SHOT)
		qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
end:
	return ret;
}

static void tcf_police_cleanup(struct tc_action *a)
{
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;

	p = rcu_dereference_protected(police->params, 1);
	if (p)
		kfree_rcu(p, rcu);
}

static void tcf_police_stats_update(struct tc_action *a,
				    u64 bytes, u32 packets,
				    u64 lastuse, bool hw)
{
	struct tcf_police *police = to_police(a);
	struct tcf_t *tm = &police->tcf_tm;

	_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
	if (hw)
		_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
				   bytes, packets);
	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
}

static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
			       int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_police *police = to_police(a);
	struct tcf_police_params *p;
	struct tc_police opt = {
		.index = police->tcf_index,
		.refcnt = refcount_read(&police->tcf_refcnt) - ref,
		.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&police->tcf_lock);
	opt.action = police->tcf_action;
	p = rcu_dereference_protected(police->params,
				      lockdep_is_held(&police->tcf_lock));
	opt.mtu = p->tcfp_mtu;
	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	if (p->rate_present)
		psched_ratecfg_getrate(&opt.rate, &p->rate);
	if (p->peak_present)
		psched_ratecfg_getrate(&opt.peakrate, &p->peak);
	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
		goto nla_put_failure;
	if (p->tcfp_result &&
	    nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
		goto nla_put_failure;
	if (p->tcfp_ewma_rate &&
	    nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
		goto nla_put_failure;

	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&police->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&police->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static int tcf_police_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tcf_idr_search(tn, a, index);
}

MODULE_AUTHOR("Alexey Kuznetsov");
MODULE_DESCRIPTION("Policing actions");
MODULE_LICENSE("GPL");

static struct tc_action_ops act_police_ops = {
	.kind		=	"police",
	.id		=	TCA_ID_POLICE,
	.owner		=	THIS_MODULE,
	.stats_update	=	tcf_police_stats_update,
	.act		=	tcf_police_act,
	.dump		=	tcf_police_dump,
	.init		=	tcf_police_init,
	.walk		=	tcf_police_walker,
	.lookup		=	tcf_police_search,
	.cleanup	=	tcf_police_cleanup,
	.size		=	sizeof(struct tcf_police),
};

static __net_init int police_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, police_net_id);

	return tc_action_net_init(tn, &act_police_ops);
}

static void __net_exit police_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, police_net_id);
}

static struct pernet_operations police_net_ops = {
	.init = police_init_net,
	.exit_batch = police_exit_net,
	.id   = &police_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init police_init_module(void)
{
	return tcf_register_action(&act_police_ops, &police_net_ops);
}

static void __exit police_cleanup_module(void)
{
	tcf_unregister_action(&act_police_ops, &police_net_ops);
}

module_init(police_init_module);
module_exit(police_cleanup_module);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
0c6965dd	3	* net/sched/act_police.c Input police filter
1da177e4	4	*
1da177e4 LT	5	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	6	* J Hadi Salim (action changes)
	7	*/
	8
1da177e4 LT	9	#include <linux/module.h>
	10	#include <linux/types.h>
	11	#include <linux/kernel.h>
1da177e4	12	#include <linux/string.h>
1da177e4	13	#include <linux/errno.h>
1da177e4	14	#include <linux/skbuff.h>
1da177e4 LT	15	#include <linux/rtnetlink.h>
1da177e4 LT	16	#include <linux/init.h>
5a0e3ad6	17	#include <linux/slab.h>
1da177e4	18	#include <net/act_api.h>
dc5fc579	19	#include <net/netlink.h>
d6124d6b	20	#include <net/pkt_cls.h>
fa762da9	21	#include <net/tc_act/tc_police.h>
1e9b3d53	22
e9ce1cd3	23	/* Each policer is serialized by its individual spinlock */
1da177e4	24
c7d03a00	25	static unsigned int police_net_id;
a85a970a	26	static struct tc_action_ops act_police_ops;
ddf97ccd	27
2ac06347	28	static int tcf_police_walker(struct net net, struct sk_buff skb,
ddf97ccd	29	struct netlink_callback *cb, int type,
41780105 AA	30	const struct tc_action_ops *ops,
41780105 AA	31	struct netlink_ext_ack *extack)
1da177e4	32	{
ddf97ccd	33	struct tc_action_net *tn = net_generic(net, police_net_id);
1da177e4	34
b3620145	35	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
1da177e4	36	}
1da177e4	37
53b2bf3f PM	38	static const struct nla_policy police_policy[TCA_POLICE_MAX + 1] = {
	39	[TCA_POLICE_RATE] = { .len = TC_RTAB_SIZE },
	40	[TCA_POLICE_PEAKRATE] = { .len = TC_RTAB_SIZE },
	41	[TCA_POLICE_AVRATE] = { .type = NLA_U32 },
	42	[TCA_POLICE_RESULT] = { .type = NLA_U32 },
	43	};
	44
2ac06347	45	static int tcf_police_init(struct net net, struct nlattr nla,
a85a970a	46	struct nlattr est, struct tc_action *a,
789871bb	47	int ovr, int bind, bool rtnl_held,
85d0966f	48	struct tcf_proto *tp,
589dad6d	49	struct netlink_ext_ack *extack)
1da177e4	50	{
fd6d4338	51	int ret = 0, tcfp_result = TC_ACT_OK, err, size;
7ba699c6	52	struct nlattr *tb[TCA_POLICE_MAX + 1];
d6124d6b	53	struct tcf_chain *goto_ch = NULL;
1da177e4	54	struct tc_police *parm;
e9ce1cd3	55	struct tcf_police *police;
1da177e4	56	struct qdisc_rate_table R_tab = NULL, P_tab = NULL;
ddf97ccd	57	struct tc_action_net *tn = net_generic(net, police_net_id);
2d550dba	58	struct tcf_police_params *new;
0852e455	59	bool exists = false;
1da177e4	60
cee63723	61	if (nla == NULL)
1da177e4 LT	62	return -EINVAL;
1da177e4 LT	63
8cb08174 JB	64	err = nla_parse_nested_deprecated(tb, TCA_POLICE_MAX, nla,
8cb08174 JB	65	police_policy, NULL);
cee63723 PM	66	if (err < 0)
	67	return err;
	68
7ba699c6	69	if (tb[TCA_POLICE_TBF] == NULL)
1e9b3d53	70	return -EINVAL;
7ba699c6	71	size = nla_len(tb[TCA_POLICE_TBF]);
1e9b3d53	72	if (size != sizeof(*parm) && size != sizeof(struct tc_police_compat))
1da177e4	73	return -EINVAL;
0852e455	74
7ba699c6	75	parm = nla_data(tb[TCA_POLICE_TBF]);
0190c1d4 VB	76	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	77	if (err < 0)
	78	return err;
	79	exists = err;
0852e455 WC	80	if (exists && bind)
0852e455 WC	81	return 0;
1da177e4	82
0852e455	83	if (!exists) {
65a206c0	84	ret = tcf_idr_create(tn, parm->index, NULL, a,
93be42f9	85	&act_police_ops, bind, true);
0190c1d4 VB	86	if (ret) {
0190c1d4 VB	87	tcf_idr_cleanup(tn, parm->index);
a03e6fe5	88	return ret;
0190c1d4	89	}
a03e6fe5	90	ret = ACT_P_CREATED;
484afd1b	91	spin_lock_init(&(to_police(*a)->tcfp_lock));
4e8ddd7f	92	} else if (!ovr) {
65a206c0	93	tcf_idr_release(*a, bind);
4e8ddd7f	94	return -EEXIST;
1da177e4	95	}
d6124d6b DC	96	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	97	if (err < 0)
	98	goto release_idr;
1da177e4	99
a85a970a	100	police = to_police(*a);
1da177e4 LT	101	if (parm->rate.rate) {
1da177e4 LT	102	err = -ENOMEM;
e9bc3fa2	103	R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE], NULL);
1da177e4 LT	104	if (R_tab == NULL)
1da177e4 LT	105	goto failure;
c1b56878	106
1da177e4 LT	107	if (parm->peakrate.rate) {
1da177e4 LT	108	P_tab = qdisc_get_rtab(&parm->peakrate,
e9bc3fa2	109	tb[TCA_POLICE_PEAKRATE], NULL);
71bcb09a	110	if (P_tab == NULL)
1da177e4	111	goto failure;
1da177e4 LT	112	}
1da177e4 LT	113	}
71bcb09a	114
71bcb09a	115	if (est) {
93be42f9 DC	116	err = gen_replace_estimator(&police->tcf_bstats,
93be42f9 DC	117	police->common.cpu_bstats,
71bcb09a	118	&police->tcf_rate_est,
edb09eb1 ED	119	&police->tcf_lock,
edb09eb1 ED	120	NULL, est);
71bcb09a	121	if (err)
74030603	122	goto failure;
a883bf56 JP	123	} else if (tb[TCA_POLICE_AVRATE] &&
a883bf56 JP	124	(ret == ACT_P_CREATED \|\|
1c0d32fd	125	!gen_estimator_active(&police->tcf_rate_est))) {
a883bf56	126	err = -EINVAL;
74030603	127	goto failure;
71bcb09a SH	128	}
71bcb09a SH	129
fd6d4338 DC	130	if (tb[TCA_POLICE_RESULT]) {
	131	tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
	132	if (TC_ACT_EXT_CMP(tcfp_result, TC_ACT_GOTO_CHAIN)) {
	133	NL_SET_ERR_MSG(extack,
	134	"goto chain not allowed on fallback");
	135	err = -EINVAL;
	136	goto failure;
	137	}
	138	}
	139
2d550dba DC	140	new = kzalloc(sizeof(*new), GFP_KERNEL);
	141	if (unlikely(!new)) {
	142	err = -ENOMEM;
	143	goto failure;
	144	}
	145
71bcb09a	146	/* No failure allowed after this point */
fd6d4338	147	new->tcfp_result = tcfp_result;
2d550dba DC	148	new->tcfp_mtu = parm->mtu;
	149	if (!new->tcfp_mtu) {
	150	new->tcfp_mtu = ~0;
c6d14ff1	151	if (R_tab)
2d550dba	152	new->tcfp_mtu = 255 << R_tab->rate.cell_log;
c6d14ff1 JP	153	}
c6d14ff1 JP	154	if (R_tab) {
2d550dba DC	155	new->rate_present = true;
2d550dba DC	156	psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
c6d14ff1 JP	157	qdisc_put_rtab(R_tab);
c6d14ff1 JP	158	} else {
2d550dba	159	new->rate_present = false;
1da177e4	160	}
c6d14ff1	161	if (P_tab) {
2d550dba DC	162	new->peak_present = true;
2d550dba DC	163	psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
c6d14ff1 JP	164	qdisc_put_rtab(P_tab);
c6d14ff1 JP	165	} else {
2d550dba	166	new->peak_present = false;
1da177e4 LT	167	}
1da177e4 LT	168
2d550dba	169	new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
f2cbd485	170	if (new->peak_present)
2d550dba DC	171	new->tcfp_mtu_ptoks = (s64)psched_l2t_ns(&new->peak,
2d550dba DC	172	new->tcfp_mtu);
1da177e4	173
7ba699c6	174	if (tb[TCA_POLICE_AVRATE])
2d550dba	175	new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
1da177e4	176
2d550dba	177	spin_lock_bh(&police->tcf_lock);
f2cbd485 DC	178	spin_lock_bh(&police->tcfp_lock);
	179	police->tcfp_t_c = ktime_get_ns();
	180	police->tcfp_toks = new->tcfp_burst;
	181	if (new->peak_present)
	182	police->tcfp_ptoks = new->tcfp_mtu_ptoks;
	183	spin_unlock_bh(&police->tcfp_lock);
d6124d6b	184	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
2d550dba DC	185	rcu_swap_protected(police->params,
	186	new,
	187	lockdep_is_held(&police->tcf_lock));
e9ce1cd3	188	spin_unlock_bh(&police->tcf_lock);
1da177e4	189
d6124d6b DC	190	if (goto_ch)
d6124d6b DC	191	tcf_chain_put_by_act(goto_ch);
2d550dba DC	192	if (new)
2d550dba DC	193	kfree_rcu(new, rcu);
1da177e4	194
2d550dba DC	195	if (ret == ACT_P_CREATED)
2d550dba DC	196	tcf_idr_insert(tn, *a);
1da177e4 LT	197	return ret;
	198
	199	failure:
3b69a4c9 YY	200	qdisc_put_rtab(P_tab);
3b69a4c9 YY	201	qdisc_put_rtab(R_tab);
d6124d6b DC	202	if (goto_ch)
	203	tcf_chain_put_by_act(goto_ch);
	204	release_idr:
4e8ddd7f	205	tcf_idr_release(*a, bind);
1da177e4 LT	206	return err;
	207	}
	208
2ac06347	209	static int tcf_police_act(struct sk_buff skb, const struct tc_action a,
10297b99	210	struct tcf_result *res)
1da177e4	211	{
a85a970a	212	struct tcf_police *police = to_police(a);
2d550dba	213	struct tcf_police_params *p;
93be42f9 DC	214	s64 now, toks, ptoks = 0;
93be42f9 DC	215	int ret;
1da177e4	216
3d3ed181	217	tcf_lastuse_update(&police->tcf_tm);
93be42f9	218	bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
1da177e4	219
2d550dba DC	220	ret = READ_ONCE(police->tcf_action);
	221	p = rcu_dereference_bh(police->params);
	222
	223	if (p->tcfp_ewma_rate) {
1c0d32fd ED	224	struct gnet_stats_rate_est64 sample;
	225
	226	if (!gen_estimator_read(&police->tcf_rate_est, &sample) \|\|
2d550dba	227	sample.bps >= p->tcfp_ewma_rate)
93be42f9	228	goto inc_overlimits;
1da177e4	229	}
1da177e4	230
2d550dba DC	231	if (qdisc_pkt_len(skb) <= p->tcfp_mtu) {
	232	if (!p->rate_present) {
	233	ret = p->tcfp_result;
	234	goto end;
1da177e4 LT	235	}
1da177e4 LT	236
d2de875c	237	now = ktime_get_ns();
f2cbd485 DC	238	spin_lock_bh(&police->tcfp_lock);
f2cbd485 DC	239	toks = min_t(s64, now - police->tcfp_t_c, p->tcfp_burst);
2d550dba	240	if (p->peak_present) {
f2cbd485	241	ptoks = toks + police->tcfp_ptoks;
2d550dba DC	242	if (ptoks > p->tcfp_mtu_ptoks)
	243	ptoks = p->tcfp_mtu_ptoks;
	244	ptoks -= (s64)psched_l2t_ns(&p->peak,
	245	qdisc_pkt_len(skb));
1da177e4	246	}
f2cbd485	247	toks += police->tcfp_toks;
2d550dba DC	248	if (toks > p->tcfp_burst)
	249	toks = p->tcfp_burst;
	250	toks -= (s64)psched_l2t_ns(&p->rate, qdisc_pkt_len(skb));
1da177e4	251	if ((toks\|ptoks) >= 0) {
f2cbd485 DC	252	police->tcfp_t_c = now;
	253	police->tcfp_toks = toks;
	254	police->tcfp_ptoks = ptoks;
	255	spin_unlock_bh(&police->tcfp_lock);
2d550dba	256	ret = p->tcfp_result;
93be42f9	257	goto inc_drops;
1da177e4	258	}
f2cbd485	259	spin_unlock_bh(&police->tcfp_lock);
1da177e4	260	}
93be42f9 DC	261
	262	inc_overlimits:
	263	qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
	264	inc_drops:
	265	if (ret == TC_ACT_SHOT)
	266	qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
2d550dba	267	end:
93be42f9	268	return ret;
1da177e4 LT	269	}
1da177e4 LT	270
2d550dba DC	271	static void tcf_police_cleanup(struct tc_action *a)
	272	{
	273	struct tcf_police *police = to_police(a);
	274	struct tcf_police_params *p;
	275
	276	p = rcu_dereference_protected(police->params, 1);
	277	if (p)
	278	kfree_rcu(p, rcu);
	279	}
	280
12f02b6b PJV	281	static void tcf_police_stats_update(struct tc_action *a,
	282	u64 bytes, u32 packets,
	283	u64 lastuse, bool hw)
	284	{
	285	struct tcf_police *police = to_police(a);
	286	struct tcf_t *tm = &police->tcf_tm;
	287
	288	_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
	289	if (hw)
	290	_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
	291	bytes, packets);
	292	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
	293	}
	294
2ac06347	295	static int tcf_police_dump(struct sk_buff skb, struct tc_action a,
5a7a5555	296	int bind, int ref)
1da177e4	297	{
27a884dc	298	unsigned char *b = skb_tail_pointer(skb);
a85a970a	299	struct tcf_police *police = to_police(a);
2d550dba	300	struct tcf_police_params *p;
0f04cfd0 JM	301	struct tc_police opt = {
0f04cfd0 JM	302	.index = police->tcf_index,
036bb443 VB	303	.refcnt = refcount_read(&police->tcf_refcnt) - ref,
036bb443 VB	304	.bindcnt = atomic_read(&police->tcf_bindcnt) - bind,
0f04cfd0	305	};
3d3ed181	306	struct tcf_t t;
0f04cfd0	307
e329bc42 VB	308	spin_lock_bh(&police->tcf_lock);
e329bc42 VB	309	opt.action = police->tcf_action;
2d550dba DC	310	p = rcu_dereference_protected(police->params,
	311	lockdep_is_held(&police->tcf_lock));
	312	opt.mtu = p->tcfp_mtu;
	313	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
	314	if (p->rate_present)
	315	psched_ratecfg_getrate(&opt.rate, &p->rate);
	316	if (p->peak_present)
	317	psched_ratecfg_getrate(&opt.peakrate, &p->peak);
1b34ec43 DM	318	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
1b34ec43 DM	319	goto nla_put_failure;
2d550dba DC	320	if (p->tcfp_result &&
2d550dba DC	321	nla_put_u32(skb, TCA_POLICE_RESULT, p->tcfp_result))
1b34ec43	322	goto nla_put_failure;
2d550dba DC	323	if (p->tcfp_ewma_rate &&
2d550dba DC	324	nla_put_u32(skb, TCA_POLICE_AVRATE, p->tcfp_ewma_rate))
1b34ec43	325	goto nla_put_failure;
3d3ed181 JHS	326
	327	t.install = jiffies_to_clock_t(jiffies - police->tcf_tm.install);
	328	t.lastuse = jiffies_to_clock_t(jiffies - police->tcf_tm.lastuse);
53eb440f	329	t.firstuse = jiffies_to_clock_t(jiffies - police->tcf_tm.firstuse);
3d3ed181 JHS	330	t.expires = jiffies_to_clock_t(police->tcf_tm.expires);
	331	if (nla_put_64bit(skb, TCA_POLICE_TM, sizeof(t), &t, TCA_POLICE_PAD))
	332	goto nla_put_failure;
e329bc42	333	spin_unlock_bh(&police->tcf_lock);
3d3ed181	334
1da177e4 LT	335	return skb->len;
1da177e4 LT	336
7ba699c6	337	nla_put_failure:
e329bc42	338	spin_unlock_bh(&police->tcf_lock);
dc5fc579	339	nlmsg_trim(skb, b);
1da177e4 LT	340	return -1;
	341	}
	342
f061b48c	343	static int tcf_police_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	344	{
	345	struct tc_action_net *tn = net_generic(net, police_net_id);
	346
65a206c0	347	return tcf_idr_search(tn, a, index);
ddf97ccd WC	348	}
ddf97ccd WC	349
1da177e4 LT	350	MODULE_AUTHOR("Alexey Kuznetsov");
	351	MODULE_DESCRIPTION("Policing actions");
	352	MODULE_LICENSE("GPL");
	353
	354	static struct tc_action_ops act_police_ops = {
	355	.kind = "police",
eddd2cf1	356	.id = TCA_ID_POLICE,
1da177e4	357	.owner = THIS_MODULE,
12f02b6b	358	.stats_update = tcf_police_stats_update,
2ac06347 JHS	359	.act = tcf_police_act,
	360	.dump = tcf_police_dump,
	361	.init = tcf_police_init,
	362	.walk = tcf_police_walker,
ddf97ccd	363	.lookup = tcf_police_search,
2d550dba	364	.cleanup = tcf_police_cleanup,
a85a970a	365	.size = sizeof(struct tcf_police),
ddf97ccd WC	366	};
	367
	368	static __net_init int police_init_net(struct net *net)
	369	{
	370	struct tc_action_net *tn = net_generic(net, police_net_id);
	371
c7e460ce	372	return tc_action_net_init(tn, &act_police_ops);
ddf97ccd WC	373	}
ddf97ccd WC	374
039af9c6	375	static void __net_exit police_exit_net(struct list_head *net_list)
ddf97ccd	376	{
039af9c6	377	tc_action_net_exit(net_list, police_net_id);
ddf97ccd WC	378	}
	379
	380	static struct pernet_operations police_net_ops = {
	381	.init = police_init_net,
039af9c6	382	.exit_batch = police_exit_net,
ddf97ccd WC	383	.id = &police_net_id,
ddf97ccd WC	384	.size = sizeof(struct tc_action_net),
1da177e4 LT	385	};
1da177e4 LT	386
5a7a5555	387	static int __init police_init_module(void)
1da177e4	388	{
ddf97ccd	389	return tcf_register_action(&act_police_ops, &police_net_ops);
1da177e4 LT	390	}
1da177e4 LT	391
5a7a5555	392	static void __exit police_cleanup_module(void)
1da177e4	393	{
ddf97ccd	394	tcf_unregister_action(&act_police_ops, &police_net_ops);
1da177e4 LT	395	}
	396
	397	module_init(police_init_module);
	398	module_exit(police_cleanup_module);